279
Fault tracing
3ADW000379R0501 DCS550 Manual e e
Analog input monitor
In case the analog input is set to 2 V to 10 V or 4 mA to 20 mA respectively it is possible to check for wire
breakage by means of AI Mon4mA (30.29). In case the threshold is undershooting one of the following actions
will take place:
1. the drive stops according to FaultStopMode (30.30) and trips with F551 AIRange
2. the drive continues to run at the last speed and sets A127 AIRange
3. the drive continues to run with FixedSpeed1 (23.02) and sets A127 AIRange
Motor protection
Armature overvoltage
The nominal value of the armature voltage is set with M1NomVolt (99.02).
The overvoltage level is set by means of ArmOvrVoltLev (30.08). Exceeding this level causes F503
ArmOverVolt.
Measured motor temperature
General
It is possible to indicate the temperatures of the motor. Alarm and tripping levels are selected by means of
M1AlarmLimTemp (31.06) and M1FaultLimTemp (31.07). If the levels are exceeded either A106
M1OverTemp or F506 M1OverTemp is set. The motor fan will continue to work until the motor is cooled
down to alarm limit. Configure this supervision by means of M1TempSel (31.05).
SDCS-CON-F:
The SDCS-CON-F provides a connection possibility for max. 1 PTC via AI2. For jumper settings, see chapter
Control board. All parameters for AI2 in group 13 have to set to default.
ATTENTION: PTC must be double isolated against power circuit.
PTC and SDCS-CON-F
Klixon
It is possible to supervise the temperature of the motor by means of klixons. The klixon is a thermal switch,
opening its contact at a defined temperature. Use it for supervision of the temperature by means of connecting
the switch to a digital input of the drive. Select the digital input for the klixon(s) with M1KlixonSel (31.08). The
drive trips with F506 M1OverTemp when the klixon opens. The motor fan will continue to work until the klixon
is closed again.
Note:
It is possible to connect several klixons in series.
Motor thermal model
General
The drive includes a thermal model for the connected motor. It is recommended to use the thermal model of
the motor if a direct motor temperature measurement is not available and the current limits of the drive are set
higher than the motor nominal current.
The thermal model is based on the actual motor current related to motor nominal current and rated ambient
temperature. Thus, the thermal model does not directly calculate the temperature of the motor, but it
X1: 8
U
7
AI2
S3: 7- 8
X2: 10
A/D
PTC
SDCS
+
-
4k75
SDCS-CON-F
Summary of Contents for DCS550 Series
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